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The original coding did this in pqDropServerData(), which seems fairly backwards. Pending commands are more like already-queued output data, which is dropped in pqDropConnection(). Moving the operation means that we clear the command queue immediately upon detecting connection drop, which improves the sanity of subsequent behavior. In particular this eliminates duplicated error message text as a consequence of code added in b15f25446, which supposed that a nonempty command queue must mean the prior operation is still active. There might be an argument for backpatching this to v14; but as with b15f25446, I'm unsure about interactions with 618c16707. For now, given the lack of complaints about v14's behavior, leave it alone. Per report from Peter Eisentraut. Discussion: https://postgr.es/m/de57761c-b99b-3435-b0a6-474c72b1149a@enterprisedb.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.